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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP3080E-SP3088E_100_062309

DESCRIPTION

FEATURES

APPLICATIONS

SP3080E-3088E

Advanced-Failsafe RS-485/RS-422 Transceivers

1/8th Unit Load, Slew-Rate Limited, ±15kV ESD-Protected

• 5.0V single supply operation

• Receiver failsafe on open, shorted or terminated lines

• 1/8th Unit Load, 256 transceivers on bus

• Robust ESD protection for RS-485 pins

o ±15kV Air-Gap Discharge

o ±15kV Human Body Model

o ±8kV Contact Discharge

• Controlled driver slew rates

o 115kbps, Low EMI (SP3080E, SP3081E, SP3082E)

o 500kbps, Low EMI (SP3083E, SP3084E, SP3085E)

o High Speed, 20Mbps (SP3086E, SP3087E, SP3088E)

•Hot Swap glitch protection on control inputs

•Driver short circuit current limit and

thermal shutdown for overload protection

•Ultra-low 400μA quiescent current

•1μA shutdown mode (except SP3081, SP3084, SP3087)

•Industry standard package footprints

• Motor Control

• Building Automation

• Security Systems

• Remote Meter Reading

• Long or un-terminated transmission lines

The SP3080E-SP3088E family of RS-485 devices are designed for reliable, bidirectional commu-

nication on multipoint bus transmission lines. Each device contains one differential driver and one

differential receiver. The SP3082E, SP3085E and SP3088E are half-duplex devices; other part num-

bers are full-duplex. All devices comply with TIA/EIA-485 and TIA/EIA-422 standards. Lead-free and

RoHS compliant packages are available for all models.

These devices are ruggedized for use in harsh operating conditions over the entire common-mode

voltage range from -7V to +12V. Receivers are specially designed to fail-safe to a logic high output

state if the inputs are left un-driven or shorted. All RS-485 bus-pins are protected against severe ESD

events up to ±15kV (Air-Gap and Human Body Model) and up to ±8kV Contact Discharge (IEC 1000-

4-2). Drivers are protected from excess current flow caused by bus contention or output short-circuits

by both an internal current limit and a thermal-overload shutdown. Devices are rated for industrial

(-40 to +85ºC) operating temperatures. Receivers have exceptionally high input impedance, which

places only 1/8th the standard load on a shared bus. Up to 256 transceivers may coexist while pre-

serving full signal margin.

All devices operate from a single 5.0V power supply and draw negligible quiescent power. All ver-

sions except the SP3081E, SP3084E, and SP3087E may independently enable and disable their

driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled.

All outputs maintain high impedance in shutdown or when powered-off.

8 PIN NSOIC

SP3082E

SP3085E

SP3088E

Half Duplex

8 PIN NSOIC

SP3081E

SP3084E

SP3087E

Full Duplex

1

2

3

4

5

6

7

8

5

6

7

8

1

2

3

4

14 PIN NSOIC

SP3080E

SP3083E

SP3086E

Full Duplex

1

2

3

4

5

6

7

8

9

10

11

12

13

14

NC

RO

RE

DE

DI

GND

GND

Vcc

NC

A

B

Z

Y

NC

Vcc

RO

DI

GND

A

B

Z

Y

GND

A

B

Vcc

RO

RE

DE

DI